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	<title>extracts files</title>
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	<h1 style="color:white">How to extract files</h1>
	<p style="font-size:26px;color:green">unzip file.zip</p>
	<p style="font-size:26px;color:green">unrar file.rar</p>
	<p style="font-size:26px;color:green">tar -xvf file.tar</p>
	<p style="font-size:26px;color:green">tar -xzvf file.tar.gz</p>
	<p style="font-size:26px;color:green">tar -xjvf file.tar.bz2</p>
	<p style="font-size:26px;color:green">tar -xZvf file.tar.Z</p>
	<h1 style="color:white">How to find some files</h1>
	<p style="font-size:26px;color:green">find / -name "libc.so.6"</p>
	<p style="font-size:26px;color:green">find / -name "libc.so.6" 2> /dev/null</p>
	<h1 style="color:white">How to search some string</h1>
	<p style="font-size:26px;color:green">grep -n "main" /home/ray/Project/main.c</p>
	<h1 style="color:white">How to search some string</h1>
	<p style="font-size:26px;color:green">grep -n "main" /home/ray/Project/main.c</p>
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